http://www.mbr-pwrc.usgs.gov/id/framlst/i3940id.html
http://www.mbr-pwrc.usgs.gov/id/framlst/i3930id.html
The ones that came to feed on our suet LOOKED different, but it wasn't until today that we had proof - the big bird and the little bird side by side on the feeder. We have not one but TWO pairs of woodpeckers, of different species.
I am enthralled.